RU2335059C1 - Method of inhibiting automatic reclosure in short-circuit state at main power source busses and close short-circuit in out coming line with faulty circuit breaker - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electric circuitry automatics. The proposed method consists in recording the short-circuit in-rush current states and measuring time intervals between them. Note here that at the instant the first short-circuit in-rush current originates at the transformer busses of the main power source, time reckoning is started, the time being equal to the ARC sectionalising switch no-current condition duration and the sectionalising switch being mounted at the standby line adjacent to the ALT station, and, also,the time reckoning is started, the time being equal to the ARC sectionalising switch no-current condition duration and the sectionalising switch being mounted at the standby line adjacent to the ALT station. Both aforesaid time reckonings over, the origination of the second in-rush short-circuit current across the main power source transformer busses is controlled. If this short-circuit in-rush current originates at the instant the time reckoning is over, the time reckoning is started, the time being equal to the ALT station cut-in time delay. The time reckoning over, the short-circuit in-rush current appearance or the said current exceeding the ratings at the standby power source transformer busses are controlled. No-in-rush-current state a faulty operation of the ALT station controller.

EFFECT: expanded performances of circuitry automatics.

3 dwg

Description

The invention relates to the automation of electrical networks and is intended to control the failure of the circuit breaker of the automatic transfer switch (ATS) point in the ring network, powered by different buses of a two-transformer substation.

There is a method of monitoring the failure of the inclusion of the ABP point for a short circuit, which consists in fixing two inrush currents and in counting the time from the moment of the appearance of the first inrush short-circuit on the tires of the transformer of the main power source, equal to the shutdown time of the ABP point, according to which at the time the countdown ends, the appearance of the second surge of the operating current is greater than normal or the short circuit current on the tires of the transformer of the backup power source and, if they are absent, they establish the fact of switching failure point ABP in the ring network [RF patent No. 2215356, class. Н02J 9/04, 13/00, publ. 10/27/2003, bull. No. 30].

The disadvantage of this method is its lack of reliability if the circuit breakers of the redundant line are equipped with automatic reclosing devices (AR).

The objective of the invention is to expand the functionality of the method by obtaining information about the failure of the operation of the ABP point in the ring network, powered by different buses of the two-transformer substation in case the redundant line circuit breakers are equipped with automatic reclosure devices.

According to the proposed method, which consists in fixing the inrush currents and in measuring the time between them, starting from the moment the first inrush current of the short circuit (short circuit) appears on the busbars of the transformer of the main power source, at the time of the appearance of the first inrush short-circuit current on the tires of the transformer of the main power source, a countdown starts equal to the shutdown time of the automatic reclosure of the sectioning switch installed on the adjacent section of the redundant line of the ABP, and they also start the counting time equal to the shutdown time of the automatic reclosure of the sectional switch installed on the adjacent main transformer bus power supply to the section of the reserved line, at the moment when the countdown of each of the indicated time intervals ends, the appearance of the second inrush current is controlled. . on the tires of the transformer of the main power source, if this inrush short-circuit current at the moment the countdown ends, it starts, the countdown starts, equal to the delay time of the ABP item, at the end of the countdown the specified time control the appearance of an inrush short-circuit or the inrush is greater than the normal operating current on the tires of the transformer of the backup power source, and in the absence of either inrush, the fact of failure of the operation of the circuit breaker of the ABP point is established.

The essence of the invention is illustrated using the drawings, where

figure 1 presents a structural diagram containing elements for implementing the method;

figure 2 - diagrams of the signals at the outputs of the elements shown in figure 1 with a short circuit at point 32 (see figure 1).

figure 3 - diagrams of the signals at the outputs of the elements shown in figure 1 with a short circuit at point 33 (see figure 1).

The circuit (see figure 1) contains a power transformer of the main power source T1; power transformer backup power source T2; section switch of tires Q3; redundant line sectioning switch Q4; redundant line sectioning switch Q5; Q6 line section switch equipped with ATS; redundant section switch Q7; redundant section switch Q8; short circuit current sensor DTKZ 9; pulse shaper FI 10; DELAY element 11; pulse shaper FI 12; element And 13; DELAY element 14; pulse shaper FI 15; pulse shaper FI 16; DELAY element 17; pulse shaper FI 18; element And 19; DELAY 20 element; pulse shaper FI 21; element OR 22; element And 23; current sensor DT 24; short circuit current sensor DTKZ 25; element NOT 26; SINGLE-VIBRATOR element 27; element And 28; element OR 29; item NOT 30; registration device RU 31; short circuit point 32; short circuit point 33; consumer 34; consumer 35.

The signal diagrams at the outputs of the elements shown in figure 1 with a short circuit at point 32 (see figure 1) have the form (see figure 2): 36 - at the output of the DTKZ element 9; 37 - at the output of the element FI 10; 38 - at the output of the element DELAY 11; 39 - at the output of the element FI 12; 40 - at the output of the element And 13; 41 - at the output of the element DELAY 14; 42 - at the output of the element FI 15; 43 - at the output of the element FI 16; 44 - at the output of the element DELAY 17; 45 - at the output of the element FI 18; 46 - at the output of the element And 19; 47 - at the output of the element DELAY 20; 48 - at the output of the element FI 21; 49 - at the output of the OR element 22; 50 - at the output of the element DT 24; 51 - at the output of the element DTKZ 25; 52 - at the output of the SINGLE-VIBRATOR element 27; 53 - at the output of the element NOT 26; 54 - at the output of the element And 28; 55 - at the output of the OR element 29; 56 - at the output of the element NOT 30; 57 - at the output of the element And 23; 58 - at the output of the element RU 31.

The signal diagrams at the outputs of the elements shown in figure 1 with a short circuit at point 33 (see figure 1) have the form (see figure 3): 59 - at the output of the DTKZ element 9; 60 - at the output of the element FI 10; 61 - at the output of the element DELAY 11; 62 - at the output of the element FI 12; 63 - at the output of the element And 13; 64 - at the output of the element DELAY 14; 65 - at the output of the element FI 15; 66 - at the output of the element FI 16; 67 - at the output of the element DELAY 17; 68 - at the output of the element FI 18; 69 - at the output of the element And 19; 70 - at the output of the element DELAY 20; 71 - at the output of the element FI 21; 72 - at the output of the OR element 22; 73 - at the output of the element DT 24; 74 - at the output of the element DTKZ 25; 75 - at the output of the SINGLE-VIBRATOR element 27; 76 - at the output of the element NOT 26; 77 - at the output of the element And 28; 78 - at the output of the OR element 29; 79 - at the output of the element NOT 30; 80 - at the output of the element And 23; 81 - at the output of the element RU 31.

In normal operation, the sectionalizing line switch equipped with the ABP Q6 item is disconnected and consumers 34 and 35 are fed through the sectioning switch of the Q4 line and the sectioning switch of the Q5 line from the power transformer T1. There is no signal at the output of the DTKZ 9 element, so the circuit does not start.

When short at point 32, at the output of the DTKZ element 9, a signal appears (see Fig. 2, diagram 36), which is fed to the input of the pulse shaper FI 10 and FI 16. They generate a signal from the decay of the signal from DTKZ 9 (see Fig. 2, diagram 37, diagram 43). The signal from FI 10 enters the input of the DELAY 11 element, which starts to count the time equal to the shutdown delay of the automatic reclosure of the Q5 section switch installed on the section of the reserved line adjacent to the ABP point (see Fig. 2, diagram 38). The signal from this element is fed to the input of the element FI 12, which generates a signal at the end of the countdown by the DELAY 11 element, that is, by the decay of the signal from the specified element (see Fig. 2, diagram 39). The signal from FI 12 arrives at one of the inputs of the element And 13. The signal from FI 16 arrives at the input of the element DELAY 17, which starts to count the time equal to the shutdown time of the automatic reclosure of the sectioning switch Q4 installed on the section of the reserved line adjacent to the transformer T1 buses (see Fig. 2, diagram 44). The signal from this element is fed to the input of the element FI 18, which generates a signal at the end of the countdown by the element DELAY 17, that is, by the decline of the signal from the specified element (see figure 2, chart 45). The signal from FI 18 is fed to one of the inputs of the element And 19. If short circuit at point 32 is stable, then after the automatic reclosure of the sectioning circuit breaker of the redundant line Q5 is activated, the signal will again appear at the output of the DTKZ 9 element, which will go to the second input of the elements And 13 and And 19 (see figure 2, diagram 36). From the output And 13 a signal will appear (see Fig. 2, diagram 40), which will start the DELAY 14. This element starts the countdown equal to the delay time of the sectionalizing switch of the Q6 line due to the operation of the ABP point. The time delay of the automatic reclosure of the sectioning switch of the redundant line Q5 is less than the time delay of the element DELAY 17 (see figure 2, diagram 44), therefore, the signal from the element FI 18 (see figure 2, diagram 45) will appear at the input of the element AND 19 with some delay relative to the signal from the element DTKZ 9, therefore, there will be no signal at the output of the element And 19 (see figure 2, chart 46). The signal from the output DELAY 14 (see figure 2, diagram 41) is fed to the input of the element FI 15, which generates its signal by the decay of the signal from the element DELAY 14, that is, at the end of the countdown of the specified time (see figure 2, chart 42). A signal will appear at the output of the OR element 22 (see FIG. 2, diagram 49). If the sectionalizing circuit breaker of the Q6 line does not work due to the operation of the ABP point, then in the line fed through the sectionalizing switches of the backup line Q8 and Q7 from the power transformer T2, the inrush current will not occur. Therefore, at the output of the element DT 24 there will be no signal sufficient for the operation of the element SINGLE-VIBRATOR 27 (see figure 2, diagram 50) and the element DTKZ 25. Therefore, at the outputs of these elements there will be no signals (see figure 2, diagram 51 ), there will be a signal at the output of the element NOT 26, but there is no signal at the output of the ONE-DIGITAL element 27 and therefore the And 28 element will not work, there will be no signal also from the output of the OR element 29, respectively, the signal that is supplied at the output of the HE 30 element to the second input of the And 23 element (see figure 2, chart 56). At the first input And 23 at this moment there is a signal from the output of the element OR 22 (see figure 2, chart 49). From the output of the element And 23 there is a signal supplied to the input of the element RU 31 (see figure 2, diagram 57). It is remembered (see figure 2, diagram 58) and is presented to the staff in some form. The signal is reset from the RU 31 element by personnel manually.

If short at point 32 is unstable, then after the sectioning switch of the Q5 line is triggered, the signal at the output of the DTKZ element 9 does not reappear due to the unsuccessful action of the AR Q5, therefore, there will be no signal at the output of the And element 13. The circuit will return to its original state.

When short at point 33, at the output of the DTKZ 9 element, a signal appears (see Fig. 3, diagram 59), which is fed to the input of the pulse shaper FI 10 and FI 16. They generate a signal from the decay of the signal from DTKZ 9 (see Fig. 3, diagram 60, chart 66). The signal from FI 10 enters the input of the DELAY 11 element, which begins to count the time equal to the shutdown delay of the automatic reclosure of the Q5 section switch installed on the section of the reserved line adjacent to the ABP point (see Fig. 3, diagram 61). The signal from this element is fed to the input of the element FI 12, which generates a signal at the end of the countdown by the element DELAY 11, that is, by the decline of the signal from the specified element (see Fig. 3, diagram 62). The signal from FI 12 arrives at one of the inputs of the element And 13. The signal from FI 16 arrives at the input of the element DELAY 17, which starts to count the time equal to the shutdown time of the automatic reclosure of the sectioning switch Q4 installed on the section of the reserved line adjacent to the transformer T1 buses (see Fig. 3, diagram 67). The signal from this element is fed to the input of the element FI 18, which generates a signal at the end of the countdown by the element DELAY 17, that is, by the decline of the signal from the specified element (see Fig. 3, diagram 68). The signal from FI 18 is fed to one of the inputs of the element And 19. If short circuit at point 33 is stable, then after the automatic reclosure of the sectioning circuit breaker of the redundant line Q4, the signal at the output of the DTKZ 9 element will again appear, which will go to the second input of the elements And 13 and And 19 (see figure 3, diagram 59). From the output And 19 a signal will appear (see Fig. 3, diagram 69), which will start the DELAY 20. This element starts the countdown equal to the delay time of the sectionalizing switch of the Q6 line due to the operation of the ABP item. The time delay of the automatic reclosure of the sectioning switch of the redundant line Q4 is longer than the time delay of the element DELAY 11 (see Fig. 3, diagram 61), therefore, the signal from the element PHI 12 (see Fig. 3, diagram 62) appears at the input of the element And 13 with some delay relative to the signal from the element DTKZ 9, therefore, there will be no signal at the output of the element And 13 (see figure 3, diagram 63). The signal from the DELAY 20 output (see FIG. 3, diagram 70) is fed to the input of the FI element 21, which generates its signal by the decay of the signal from the DELAY 20 element, that is, at the end of the countdown of the indicated time (see FIG. 3, chart 71). A signal will appear at the output of the OR element 22 (see Fig. 3, diagram 72). If the sectionalizing circuit breaker of the Q6 line does not work due to the operation of the ABP point, then in the line fed through the sectionalizing switches of the backup line Q8 and Q7 from the power transformer T2, the inrush current will not occur. Therefore, at the output of the DT 24 element, a signal sufficient for the operation of the DTKZ 25 and SINGLE-VIBRATOR 27 elements will not appear (see Fig. 3, diagram 73). Therefore, there will be no signals at the outputs of these elements (see FIG. 3, diagram 74, diagram 75). There will be a signal at the output of the element NOT 26 (see Fig. 3, diagram 76), but there is no signal at the output of the SINGLE-VIBRATOR element 27 and therefore the And element 28 will not work (see Fig. 3, diagram 77), there will be no signal from the output either element OR 29 (see figure 3, diagram 78), respectively, at the output of element NOT 30 there will be a signal that will be fed to the second input of element AND 23 (see figure 3, diagram 79). At the first input And 23 at this moment there is a signal from the output of the OR element 22 (see figure 3, diagram 72). From the output of the element And 23 there is a signal supplied to the input of the element RU 31 (see figure 3, diagram 80). It is remembered (see figure 3, diagram 81) and is presented to the staff in some form. The signal is reset from the RU 31 element by personnel manually.

If short at point 33 is unstable, then after the sectioning switch of the Q4 line is triggered, the signal at the output of the DTKZ 9 element does not reappear due to the unsuccessful action of the AR Q4, therefore there will be no signal at the output of the And 19. element. The circuit will return to its original state.

If in the redundant line powered by transformer T2, an inrush current will occur. or the inrush is greater than the normal operating current due to the successful operation of the ABP item installed on the Q6 sectionalizing circuit breaker, there will be no signal at one of the inputs of the And 23 element (from the NOT 30 element) and the circuit will not work.

Information will go to the service personnel only in case of failure of the operation of the ATS item.

Thus, the proposed method allows you to give timely information about the failure of the circuit breaker item network ABP. This will undoubtedly lead to an increase in the reliability of power supply to consumers through the adoption, on the basis of the information received, by the operational staff of the necessary decisions. The method has enhanced functionality by obtaining information about the failure of the operation of the ATS point in a ring network powered by different buses of a two-transformer substation if the circuit breakers of the redundant line are equipped with automatic reclosure devices.

Claims (1)

A method for controlling the failure of the automatic transfer switch (ATS) in a ring network powered by different buses of a two-transformer substation, which consists in fixing the inrush currents and in measuring the time between them, starting from the moment the first inrush of the short circuit occurs (short circuit) tires of the transformer of the main power source, characterized in that at the time of the appearance of the first inrush short circuit on the tires of the transformer of the main power source, a countdown starts equal to a dead time pause of the automatic restart (AR) of the sectionalizing circuit breaker installed on the section of the redundant line adjacent to the ABP point, and also a countdown time equal to the dead time delay of the automatic reclosure breaker of the sectional switch installed on the adjacent with the tires of the transformer of the main power supply section of the redundant line, at the end of the countdown of each of these periods of time control iruyut occurrence of short-circuit current of the second roll on the tires of the transformer of the main power source, if this inrush short-circuit current at the moment the countdown ends, it starts, the countdown starts, equal to the delay time of the ABP item, at the end of the countdown the specified time control the appearance of an inrush short-circuit or the inrush is greater than the normal operating current on the tires of the transformer of the backup power source, and in the absence of either inrush, the fact of failure of the operation of the circuit breaker of the ABP point is established.

Images